diff --git a/AGENTS.md b/AGENTS.md
index a55750a..bdec352 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -6,6 +6,12 @@
 - Legacy data under `legacy/` is for migration only; once DB migration is complete,
   the runtime will no longer depend on legacy data.
 
+## Project Naming
+- Official name: 삼국지 모의전투 HiDCHe
+- Common nicknames: 삼모, 삼모전, 힏체섭
+- Short forms in code/docs: sammo, hidche
+- TypeScript rewrite working name: sammo-ts
+
 ## Project Structure & Module Organization
 - `legacy/` contains the application source. This is the active codebase.
 - PHP entry points live under `legacy/` and `legacy/hwe/` (for example `legacy/index.php`, `legacy/hwe/index.php`).
diff --git a/docs/architecture/overview.md b/docs/architecture/overview.md
index fc495d4..6c97129 100644
--- a/docs/architecture/overview.md
+++ b/docs/architecture/overview.md
@@ -4,6 +4,13 @@ This repository contains both the active legacy PHP game and an in-progress
 TypeScript rewrite. The legacy engine remains the source of truth while the
 monorepo plan is prepared alongside it.
 
+## Project Naming
+
+- Official name: 삼국지 모의전투 HiDCHe
+- Common nicknames: 삼모, 삼모전, 힏체섭
+- Short forms in code/docs: sammo, hidche
+- TypeScript rewrite working name: sammo-ts
+
 ## Layers
 
 - Legacy runtime: PHP entry points under `legacy/` and `legacy/hwe/`